I am working in company A and accepted offer of company B. Now company B has filed for my H1 transfer premium processing. Couple of days before I got another better opportunity from company C. I want to join company C now but have concern that my H1 transfer to company B will probably get approved next week. If I get my H1 transfer approval for company B then can I still choose not to join company B and start another H1 premium transfer process from company A to company C without any issues OR I have to join company B once my H1 get transferred to them and then transfer H1 from company B to company C ?